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SUBTRACTION Self-Correcting Quiz - NINES

1
16
-  9
2
18
-  9
3
16
-  9
4
12
-  9
5
11
-  9
6
10
-  9
7
10
-  9
8
18
-  9
9
15
-  9
10
14
-  9
11
17
-  9
12
13
-  9
13
13
-  9
14
11
-  9
15
15
-  9
16
14
-  9
17
17
-  9
18
12
-  9
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